<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Hello Page</title>
</head>
<body>
<h1 th:text="${message}"></h1>
<form action="/use/Problem" method="post"  class="center">
    <input type="submit" value="答案">
</form>

</body>
</html>